Contextualizing the influence of climate and culture on bivalve populations: Donax obesulus malacology from the north coast of Peru
Contextualizing the influence of climate and culture on bivalve populations: Donax obesulus malacology from the north coast of Peru
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DOI：
10.1080/15564894.2021.1991055
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
J. Warner;Aleksa K. Alaica
中科院分区：
文献类型：
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作者：
J. Warner;Aleksa K. Alaica
摘要气候（不）稳定性可以体现在软体动物的大小，证明对生长，季节性开发和文化持久性的可变影响。我们目前的人口统计的高度的一个双壳类物种（Donax obesulus）从可以追溯到早期地平线的遗址中采集（公元前900-200年）在Nepeña山谷和中地平线（MH，600-1000 CE）在北方沿海秘鲁的Jequetepeque山谷，并将它们与古气候记录和现代贝壳样本进行比较（2012年、2014年和2016年采集）来自尼佩尼亚山谷。我们观察了D的大小的历时变化。obesulus，在EH期间具有较大的双壳，在MH期间和现代样品中具有较小的壳。D.在MH期间，通过两个子阶段，在一个部位的Obesulus大小保持相对静止。这些双壳类种群可能受到气候和文化环境的影响。厄尔尼诺相关的降雨（%岩屑通量）从以前公布的附近的海洋沉积物芯径流代理升高在EH和晚莫什阶段的MH和相关的壳高度。然而，在MH的过渡阶段和现代间隔期间，与EH相比，厄尔尼诺活动和壳高度相对减少。
Abstract Climate (in)stability can manifest in the size of mollusks attesting to variable impacts on growth, seasonal exploitation, and cultural persistence. We present population statistics of the height of a bivalve species (Donax obesulus) collected from sites dating to the Early Horizon (EH, 900–200 BCE) in the Nepeña Valley and the Middle Horizon (MH, 600–1000 CE) in the Jequetepeque Valley of northern coastal Peru and compare them with a paleoclimate record and a sample of modern shells (collected in 2012, 2014, and 2016) from the Nepeña Valley. We observe diachronic variation in the size of D. obesulus with larger bivalves during the EH and smaller shells during the MH and in the modern sample. D. obesulus size remains relatively static during the MH at one site through two sub-phases. These bivalve populations were likely impacted by both climate and cultural circumstances. A proxy for runoff from El Niño related rainfall (%lithic flux) from a previously published nearby marine sediment core is elevated during the EH and Late Moche phase of the MH and correlates with shell height. During the Transitional phase of the MH and the modern interval, however, there are periods of comparatively reduced El Niño activity and shell height compared to the EH.